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Polarized Ferroelectric Polymers for High‐Performance Perovskite Solar Cells
Author(s) -
Zhang CongCong,
Wang ZhaoKui,
Yuan Shuai,
Wang Rui,
Li Meng,
Jimoh Musibau Francis,
Liao LiangSheng,
Yang Yang
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201902222
Subject(s) - materials science , perovskite (structure) , ferroelectricity , perovskite solar cell , energy conversion efficiency , optoelectronics , ferroelectric polymers , polymer , solar cell , crystallite , doping , chemical engineering , dielectric , composite material , engineering , metallurgy
In hybrid organic–inorganic lead halide perovskite solar cells, the energy loss is strongly associated with nonradiative recombination in the perovskite layer and at the cell interfaces. Here, a simple but effective strategy is developed to improve the cell performance of perovskite solar cells via the combination of internal doping by a ferroelectric polymer and external control by an electric field. A group of polarized ferroelectric (PFE) polymers are doped into the methylammonium lead iodide (MAPbI 3 ) layer and/or inserted between the perovskite and the hole‐transporting layers to enhance the build‐in field (BIF), improve the crystallization of MAPbI 3 , and regulate the nonradiative recombination in perovskite solar cells. The PFE polymer‐doped MAPbI 3 shows an orderly arrangement of MA + cations, resulting in a preferred growth orientation of polycrystalline perovskite films with reduced trap states. In addition, the BIF is enhanced by the widened depletion region in the device. As an interfacial dipole layer, the PFE polymer plays a critical role in increasing the BIF. This combined effect leads to a substantial reduction in voltage loss of 0.14 V due to the efficient suppression of nonradiative recombination. Consequently, the resulting perovskite solar cells present a power conversion efficiency of 21.38% with a high open‐circuit voltage of 1.14 V.